As far as schlock sci-fi/horror goes, this isn't bad. The story moves along at a good pace. George Zucco
stars as a vengeful madman, similar to his earlier role in The Mad Monster
. Not many actors are convincing doing solo exposition in schlock movies, sometimes hilariously not, but Zucco, like Karloff, has the bearing and delivery to pull it off.
He plays an anthropologist that has discovered the lost treasure of ancient Aztec emperor Montezuma, as well as the serpent god that has protected it, Quetzalcoatl, and he uses the monster to eliminate those that he believes might threaten or might have threatened his booty. They did a pretty good job animating and flying Quetzalcoatl, considering. Amazingly, one of its feathers looks a lot like a peacock feather.
I downloaded the 819MB MPEG2 file. Dark scenes were often too dark to make out what was going on, and there were missing frames here and there, which were annoying at times. Otherwise, the video was good. The audio crackled sometimes, but dialog was clear.